This app was mentioned in 1 comment, with an average of 1.00 upvote
I use and love this droid app
https://play.google.com/store/apps/details?id=com.synformation.android.forzadroid
It takes the vehicles weight, down force and tyre size into consideration and will give you all the numbers you need for turning.
This will give you a good base tune to start tinkering with.